Vacuum peed device fob



down y ARTHUR L. PAYTON, 0F CHICAGO, ILLINOIS.

VACUUM EED DEVICE FOB CBBURETERS.

Specioation of Letters Patent.

Patented Mar. 2, 1920.

Application ledliay 18, 1917. Seria! Io. 169,438.

To ad! whom 'it may concern.'

Be it known that I, ARTHUR L. PAY'ioN, a citizen of the United States, lesidn at Chicago. in the county of Cook and tete of Illinois. have invented n. certain new und useful Improvement in Vacuum Feed Devices for Corbureters, of which the followingis a fuli, clear, concise, and exact description, reference being had to the accompanying drawings, forming e part of this specification.

My invention relates to vacuum feed de vices for cerbureters and has for its object the provision of improved means associated with o. curbureter and a fuel supply reservoir located below the level of the Carbureter und arranged to feed the fuel from the supply reservoir up into the fuel chamber of the carburetor.

lt has been the practice in the past in forcing or feeding fuel from the supply res ervor up into the carburetor to provide what commonly referred to als e vacuum tenk which is located above the level of the oarhureer and which has communication with both the supply reservoir and the cerhureter. The vacuum trunk is subjected to some. vacuum or pressure reducing means so that it difference of pressure is provided between the vacuum tank and the supply reservoir. Due to thc reduction of pressure thus provided in the vacuum tank the fuel is forced from the supply reservoir into the tout' end is permitted hy gravity to How vinto the carburetor es the cerhrreter requires fuel. The. vacuum producing mee ns has usually been provided by connecting the vacuum tank with the in- {olie manifold ofthe engine or with that portion of the carburetor in which the pressun;-` is. reduced upon operation of the internal combustion engine with which the carburetor und manifold are associated.

lt is one of the objects of the present invention to provide a` vacuum feed tank between thc fuel supply reservoir and the carburetor, means for causing' a `reduction of pressure in thc tnnk1 end a differential pumping: devicer operated by the reduction of pressure und arranged to pump the fuel from the supply reservoir to the tank. The diilereutinl pumpingr device is provided by utilizing a. piston-like member havingtwo .-'liffercni Working areas, one greater than the other. the greater aree being subiected to the reduced pressure provided by the inyeonteining the valve sent `the passageway `8 terne] combustion engine and that portion of the pum forming the lesser area a1'- renged to li t the fuel from the supply reservoir to the tank.

In the preferred form of my invention this differential pumping device is made up in the form of n float so that it not only acts es :i pumping member when the tank is in condition to receive fuel from 'the supply reservoir. but also nets es n means for controiling the passageway extending between the vacuum tank and the intake manifold so thart the operation of the differential pump may he discontinued when the fuel 1n tllxe tank reaches e certain pre-determined leve These and other improved features of my invention will be pointed out in detail in connection with the accompanying drewin rs wherein:

igure 1 is a. vertical cross sectional view nf the device of my invention;

Fig. 2 is s horizontal cross sectional view token along the line 2-2 of Fig. 1 looking' in the direction indicated by the arrows; and

Figa` 3 is a fragmentary view similar to Fig. l showingv the differential pump in its uppermost position.

Similar characters of reference refer to similar pants throughout the several views.

In Fig. L 4 designates a power cylinder having* the. internal threads 5 and 6 et the bottom and top thereof respectively. The

threads 6 ere arranged to coperate with end hold. in place the cap 7 containing an air inlet passageway 8 andthe valve seat 9. The passageway 8 communicates With the gooseneck 10 open to the atmosphere. The cap 7 contains en exhaust passageway 11 12 sind communicating with the conduit 13 which extends to the inta-ke manifold of the engine, or to that portion of the carburetor such as the atom- :zing' chamber in which a vacuum or reduction of pressure is produced upon operation of the eng-ine. Extending upwardly into and arranged to *cooperate with the inlet valve seat 9 is the valve 14 pivoted at 15 to e. lever 16. The Valve lever 16 is in turn pivoted et 17 to e stud 18 ex` tending downwardly from the cap 7. Arranged to coperate with the valve sont 12 and to extend into the passageway 11 is nu exhaust valve member 19 pivoted at 20 to the lever 16. Mounted for oscillation upon the pivot pin 17 is a float lever Q1 extending to the axis of the cylinder il and pivotally connected at 22 to a downwardly extending rod 23 having the head 2l. The pin 22 and the pin 20 are connected by the coiled tension spring 43, the function of the spring being to operate the valves 14 and 19 quickly when such action is to take place.

As most clearly shown in Fig. 1 the lower end of the rod Q3 has lost motion connection with the differential pump device 2.5, consisting of a oat member "26 and the pump member 27. The float member 2G is made slightly smaller than the inside diameter of the cylinder Il so as to provide the space 2i' between the float and cylinder into which oil or fuel may ass to seal the upper side of the 'Boat 26 rom the lower side. The piston membervZT consists of a cylindrical cup shaped member 28 having a cap 29 scoured thereto in any suitable manner. The cap is provided with a numbei ot' openings shown at 30--30 in Figs. 1 and 2. Attached to the .central portion of the piston 27 is an upwardly extending rod 31 having a hook 32 extending through a downwardly projecting hook 33 provided on the undcrsidr` of the oat 26. The purpose of the connection .32 and 33 is to connect the lloat .l and piston 27 so that they operate or movlvertically in unison` but so that they may have slight relative lateral movement. The lower and of the piston 2T carries the downwardly nenti-ng valve member Bil. The entire pistou '.nember 27 is arranged to reciprocate within the pump cylinder 35 attached to the hase 86 having threading engagement with the threads 5 of the cylinder 4. as illustrated. The inside of the cylinder communicates with the passageway 37 havin i' a downwardly seating fuel inlet checii valve 258 therein and communicating with the conduit 39 extending downwarilly to and communicating with the interior of the tucl supply reservoir. 'I he cap 3G is also provided with the passageway 4f) communicating with the inside of the cylinder -l at a` point outside of the cylinder 35 and containing an upwardly seating fuel outlet check valve 41.V The passageway 40 is connected with the "'uel chamber ot the carburctcr by .'he conduit shown at 42. The interior ot' the cylindr4 and that portion of the cylinder located below the tloat 2G connnunicatcs with the utmosphere through the pipe lil'.

The operation ot' thedevice is as follows: Assuming the parts to be in thc position shown in Fig. l and that the engine whose int ike maiiifold is connected with the conduit 13 is operating a vacuum or reduction of pressure isproduced in the vacuum chamber shown at A between the top of the float 26 and the Tap 7. Due to the vacuum or reduction of pressure thus provided in this chamber tho entire diierenfial pump mechanism including the oat 26 and the piston zi will move upwardly thus causing a reduction of pressure in the suction chamber shown at B which results in a flow of fuel from the supply reservoir upwardly through the conduit 39, past the check valve 38, and into the chamber B. After the dilerential pump mechanism has moved upwardly a certain distance the head 24 of the rod 2B is engaged by the float 2G and the lever 2l moved upwardly about its pivot 1T. When the lever 2l has been moved upwardly a distance suliicient to bring the pin above the pivot pin 1i' so that the center line of the spring 43 assumes a position above the pin li' the level' lf3 will be oscillated in a clockwise direction (Fig. l) so that the valve 19 copcrates with the seat l2 and the valve 14 moves downwardly to provide communication between the chamber A and the atmosphere. The last mentioned operation of the valves l-i and lll thereby produces atmospheric pressure in the chamber A so that gravity is iermitted to lower the differential pump mcclianism and the pump mechanism will be so lowered unless the supply chamber C contains a quantity of fuel which prevents such loweringr of the pump mechanism. As the pump mechanism lowers the fuel in chamber li passes upwardly through the check valve lil into thc cylinder 29. When the dilicrential pump mechanism has been lowered to the position shown in Fig. l the spring l' is moved below tbc piu 17 so as to oscillare the. lever 1li and again provide comuumication between the. chamber A and the intake lnairfold ot' the engine and prevent communicaiion between the chamber A and the atmosphere. The operation above, described is then repeated.

After the fuel is taken into the pump piston .28 it is passed over the top of the cylinder 3? into the chamber C from which it is allowed to pass by gravity downwardly into the fuel chamber of the carbureter. When thc chamber C contains a sutlicient amount ot' fuel the float 2li and thus the entire differential pump mechanism is not permitted to move downwardly and thus provide communication between the chamber A and the intake manifold of the, engine until enough t'uel from the chamber C has been taken in b v the carbureter through the conduit l2 t0 permit such downward movement. whereupoirthc chamber C 'is again filled and the pump mechanism held idle until the cuiv4 buretcr again takes a suilicieut amount to lower the float 2li to a position where the valve lll is again opened.

in Figi. 3 l have shown the Hoet 2G in its` uppermost position and the valves 19 and lei closed and open respectively.

Having thus described my invention what I claim as new and desire to secure by Lettcatent oi' the United States is:

1. In a i'ilcuum fuel feed tank the combination oi' u pair of differential Gym; rs, the lau-ger cylinder forming a power` der and the, smaller n pumping cylinder, differential pumping rnchenisui reciprocably mounted in the cy iindersysnid mechatnism comprising :i lout disposed within the power cylinder und u piston member :1ttuclzed to the float und disposed in the pump cylinder. :isuction conduit eon'nnunicating with the power cylinder` and vulve mechanism controlled by the float for regulating conununication between the suction conduit und the power' cylinder.

In n. vacuum fuel feed tu'nk the combination of u Apair of differential cylinders, the lnrg'er cylinder forming u power clvlinder und tile smaller a pumping cylinder,` the upper end oi' the pump cylinder com municuting." willi the power cylinder, difl'ercntinl `pump mechanism roeiprocubly mounted within tlie cylinders. said mechanism comyu'isingf n floot disposed in the. power cylinder und u piston member ntlncbed llicrcto und disposed in tbe pump cylinder, u l'ucl inlet :1L tbc lower end of tbc pump cylinder. u l'ucl outlet :n the lower cud oli' lin power cylinder. u :uu-tion conduit nl tlze upper cud of tbe power cylinder, nud valve meclninism controlled by the Hout for rcn'ulutinp' communicution between the suctionI ronduit und tbc power cylinder.

In n vacuum fuel feed tunl.' tbc cour binntion ot' :l pnir ot dili'erenliul cylinders, tbc larger cylinder VlormimLr u power cylinlcr :nul tlnsnmller u pumping` cylinder, ilu,- uppcr c'lnl ol" the pump cylinder columuuirutiup' with tllc power cylinder. dil'- i'crcutiul pump mccliunism reciprocubly mounted witbin tbe cylinders. said merlinnism compris-innr :i flo-it piston disposed in the power cvlimlcr und n piston member utlm'lu-l tlierclo und disposed iu ille pump cylinder. u dounwurdly scaling cllecl: vulve in the pistou member. n. t'ucl inlet at the lower end ol' the pump cylinder, u fuel outlet :it the lower cnd of the power cylinder. e suction conduit at the upper cud ot the power cylinder. nu :nir wut ut tlic upper end ol' tlm power cylinder, vulrc mcclnluism cofitrollcd by tbc flour piston for regulating rourniunirntiou betw'ccn lille powl c vlindc :unl llic suction conduit und nir rent. und bn nir rent l'or tbc power c vlindcr below lille lloui piston therein,

i. The combinution with communicntng power und pump cylinders. of ditrcrcnliul pumping menus locnted in suid cylinders comprising n member located in said pdfwer cylinder, u pistou member located in said pump cylinder und nctuutql'gby said lli-tf named :nruubcr` menus for establishing communication between snid'power cylindertund n source of suction, and means 'actuated by said first muncd member for connecting said power cylinder with and disconnecting it from seid source of suction.

. The combination with communicnting power and pump cylindeis of pumping means located in Seid. cylinders comprising n member located in said power cylinder, :i piston member located in seid pump cylin der and actuated by said first-named ineinber, menus for estnblisliino con'nnunictition between said power cjlinter und n source of suction, and means actuated by seitllirst named member for connecting sui-l power cylinder with und disconnecting it from said source of suctionV 6. The combination with u power cylinder, of n pumping means comprising a pump cylinder cononunicnting with seid power cylinder, n piston member in seid pump cylinder. means in seid power eylin= der for actuating said piston member, seid actuating nie-.111s beingr controlled lo' the level of the liquid 1n sind power under delivered thereto by uuid Innnping ineens.

7. The eombimrtion witb n stornge clnnnbei', ot' menus tor establishing connnunieution between smid storage clunnber und, e carinii-etw'. und menus for pmnping .foei from n level below the ierel ol su id ster-.ige chamber und delivering it to stin'uge clunnber. comprising: n combined tir-:it piston member controlled bj: tinY level oi' tl Y fuel in said storage receptacle.

8. The combination with conununicating power und pump cylinders of differential pumpingY mei-ins foi said cylinders commis-- ing' u member located in said poner cylindcr. :i mm able woll for szzid pump cylinder und nctuntell by snid member, means for establishing communication between said power cylinder und :t source of suction und menus uctnntcd by sold member for con- Vuecting said power cylinder with and dismmnccting it from seid source of suction.

9. The combination with communicating power and pump cylinders of differential pmupimgr menus for said cylinders comprisiupr n member located in seid power cylinder. n movable Wnllfor su id pump lrylinder und :actuated by Suid member, means for eslnblisliingr Vcomnmnicntion between Suid power evlimlcr und a source oi' suction and means or connectingr Suid power cylinder with und disconnectingit from said source ol suction.

ln witness wlureot' I hereunto subscribe my mime this 12th day ol llil'ay, A. D. 1917'.

ARTHUR L. PAYTON Witnesses c A.. G. .MoSiLnm SoMAn MmnLefroN. 

